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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17916bee75be2a65d66f7e27c28bab6cb1b4c9efa2a6ecc864d4d93e56ab80cf' 
  AND token = 'CpltUvUqgiD7qMVta2Rf2W8YpYIqrPOHWJJGZswZiPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}